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ALBERT H. POTTER,V 0E WILLI-AMS EUEG. NEW YORK. Letters Patent No. 7fi,6.46, dated Jduuary 21, '1868.

IMPROVEMENT IN GHRONOMETER-ESGAPBMENT.

TQ ALL WHOM I'l MAY CONOERN:

Be it known that I, ALBERT H. POTTER, of Williamsburg, in the county of Kings, in the State of.New York, have invented a new and useful Escap'ement for Watches and other TimefPieces; and I do hereby declare i that the following is a full, clear, and-exact'descripton of the construction and operation of the same, reference being had to the annexed drawings, making a partei` this specification.

A A A, Figure I, are the escapement-wheel, similar in its construction to th ordinary chronometcr-whel,

except that it has shorter and more obtusely-pointed teeth. B is a pallet, which serves to lock and unlock only.

B is apallet, which serves to lock and impulse; C is a lever, which, with its fork L and pin Q, is the same in Y construction as'in the ordinary levcr-escapement. The pallets B B and lever C are rigidly attached to the arbor K, which ispivoted into the plates of the movement. The roller R is rigidly attached to the arbor D is an'im'pulse-pallet, also rigidly attached to the arbor M.

The operationof the escapemcnt is-slfollows: The escape-wheel, Fig. is bearing in the direction shown by the arrow y. The tooth H is represented aslocked on the pallet B, where'it will remain until the pin Q (which is set'iu the roller R) enters the fork L in thedi-rection shown by the arrowp, carrying the lever()1 with it.V It will be perceived that as the pallets B and'B are rigidly attached to and more on the samecentrewith the lever C, thetooth H will nowbe disengaged from its locking at B, aud the escape-wheel, being thus set free,

will advance, and the tooth N dropon the-pallet D, which will have arrived at thatmoment in a position to receivethel tootlfNand'ei'ts consequent impulse. At the termination of this impul'sjefthe eseapement will assume the position as shown in Figure IVI, the tooth H now being locked by vthe pallet B, in which condition it will remain .until the force ofthe impulse and momentum of the balance are overcome by the resistance of the pendluxn or hair-spring, (notshown and the motion 'of' the roller B. and pallet D is revcrsed, and the pin Q enters the fork/Liu the direction of thcarrow, and carries the lever C so fa-r as to allow the dat end o f the pallet B to slide past the point ofthe toothH, when it will be unlocked, vand thc 'face of the tooth will press against-the back face, Z, of the pallet B', thus eecting an impulse which is 'transferred to the roller R through the medium ol the lever C, fork L, and pin Q. At the termination of this impulse, the next tooth, P, will lock o'u the pallet B, as in Fig. Y

Itwill bc`seen that, although I employ the-lever C and forli. L, asin the ordinary lever-escapement, yet the impulso communicated through it diters very widely from said lever-escapement, inasmuch as in my escapement the construction, arrangement, and operation of the pallet B is such as to do 'away with incline-plane impulse-pallets, which are employed in the ordinary lever-escnpcments, thus obriating the necessity of oil, which is a very desirable end to'attain in afn escapement. Another advantage in my escapement is, thatthe nature of its construction and operation admits of short and stubby-teeth for the escape-wheel, thus affording strength and durability. I

`A point of merit which my escapement possesses 'over the ordinary ehronomctcrs is, that while their impulses in ono direction are similar, mine has also ann impulse in the opposite direction, which is not the case with the ordinary chronometer, thus obviating the liability of stopping or becoming set, from causes such as jars or knocks, while being handled or carried in the pocket.

The particular kind of impulse of the chronometer-escapenient is admitted as goed and desirable; but as its impulse is con-finedto one direction only, andas it is necessary in that escapement to employ two delicate springs, whichre troublesome to construct and-keep in repair, it therefore comes far short of a perfect escapelnent. vInlny device Iproducc the chronometer-impulse in one direction, besidesl an impulse in the opposite direction and all this I accomplish in a simple and substantial manner, without theuse of springs or other tenuous equivalents.

What I claim as my invention, and desire to secure by VLetters Patent, Ai-s- Y 4The pallets B and B', rigidly attached to the arbor K, in combination with the obtusely-pointed toothed 'escape-wheel A A A, lever C, fork4 pin Q, rollex`- B, and pallet D, all constructed,"arranged, and operating I substantially as herein described and specified.

A. H'. POTTER. Witnesses:

T. W. BURGER, J. Woonwonrn. 

